<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        a{
            color: #000;
            text-decoration: none;
            font-size: 50px;
        }
        [href]{
            background-color: yellow;
        }
    </style>
</head>
<body>
<a href="http://www.baidu.com">百度</a>
</body>
</html>